Kikuyu is also known as Giguyu, Gekoyo, and Agekoyo. The Kikuyu translation of "May Peace Prevail on Earth" is
They are the largest ethnic group in Kenya. They are the 4.5 million people who call themselves Gekoyo or Agekoyo but who are referred to by others as Kikuyu. An alternate spelling of the translation is:
THAYU UIYURE THIINE WA THI YOTHE
I update translations as times change and the way people express things change.